4 years ago

A _ __ is a machine that makes work easier when a single force is applied.

Physics

1 answer:

svlad2 [7]4 years ago

5 0

the answer is A i took a test

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A boat moves through the water with two forces acting on it. One is a 2000 N forward push by the water on the propeller, and the

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Answer:

a). a=0.2 $\frac{m}{s^{2} }$

b). x=10m

c). v=2 $\frac{m}{s}$

Explanation:

Force forward push = 2000N

Resistive force due water=1800N

Net force=2000N-1800N

Fn=200N

m=1000kg

t=10sec

a).

$F_{n} =m*a\\a=\frac{F_{n}}{m}\\ a=\frac{200N}{1000kg}\\ a=0.2 \frac{m}{s^{2} }$

b).

$x_{f}=x_{o}+ v_{o}*t+\frac{1}{2}*a*t^{2}\\x_{o}=0\\v_{o}=0\\x_{f}=\frac{1}{2}*a*t^{2}\\x_{f}=\frac{1}{2}*0.2*(10)^{2} \\x_{f}=10m$

c).

$v_{f}=v_{o}+a*t\\v_{o}=0\\v_{f}=a*t\\v_{f}=0.2\frac{m}{s^{2} }*10s\\v_{f}=2\frac{m}{s}$

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3 years ago

A piece of aluminum requires 4,000 J of energy to change

photoshop1234 [79]

Answer:

Mass, m = 105.58 g

Explanation:

We have,

Heat required in aluminium to change the temperature from 68°C to 110°C. It is required to find the mass of aluminium.

Concept used : Specific heat capacity

Solution,

The heat required to raise the temperature is given by :

$Q=mc\Delta T$

c is specific heat capacity, for Aluminium, c = 0.902 J/g-°C

$m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{4000\ J}{0.902\ J/g^{\circ} C\times (110-68)^{\circ} C}}\\\\m=105.58\ g$

So, the mass of aluminium is 105.58 grams.

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4 years ago

A _______ ________ is a machine that makes work easier when a single force is applied.

A _ __ is a machine that makes work easier when a single force is applied.